The Quantum State of a Laser Field

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  • 25 April 2001
Abstract
Optical implementations of quantum communication protocols typically involve laser fields. But the standard description of the quantum state of a laser field is, surprisingly, insufficient to fully understand the quantum nature of such implementations. We give here a quantum information-theoretic description of a propagating CW laser field and reinterpret typical quantum-optical experiments in light of this. In particular we show that contrary to recent claims [T. Rudolph and B. C. Sanders, quant-ph/0103147], a conventional laser can be used for quantum teleportation with continuous variables and for generating continuous-variable entanglement.

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